class ParallelTests::CLI

def run_tests_in_parallel(num_processes, options)
  test_results = nil
  run_tests_proc = -> do
    groups = @runner.tests_in_groups(options[:files], num_processes, options)
    groups.reject!(&:empty?)
    test_results = if options[:only_group]
      groups_to_run = options[:only_group].map { |i| groups[i - 1] }.compact
      report_number_of_tests(groups_to_run) unless options[:quiet]
      execute_in_parallel(groups_to_run, groups_to_run.size, options) do |group|
        run_tests(group, groups_to_run.index(group), 1, options)
      end
    else
      report_number_of_tests(groups) unless options[:quiet]
      execute_in_parallel(groups, groups.size, options) do |group|
        run_tests(group, groups.index(group), num_processes, options)
      end
    end
    report_results(test_results, options) unless options[:quiet]
  end
  if options[:quiet]
    run_tests_proc.call
  else
    report_time_taken(&run_tests_proc)
  end
  abort final_fail_message if any_test_failed?(test_results)
end